Granted Patent
Utility
US 5,273,841 · App. 07/904,324
Sulfuric acid concentration sensor and lead acid battery equipped with sulfuric acid concentration sensor
Inventors:
Takakazu Yamamoto, Shigeru Sano
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Jun 25, 1992
Inventors
Takakazu Yamamoto
Shigeru Sano
Assignees (at issue)
Yuasa Battery Co., Ltd.
Takakazu Yamamoto
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.